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Rice weevils can fly, possibly from outside the window.
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Then look for what you have in your own food.
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Rotting soil, plants and everything can have insects.
The bathroom is more humid, it is recommended to ventilate frequently, because the bathroom is more humid, there should be insects in summer, and they like to shade and damp places, and the bathroom is like this.
This is also where the habit of scorpions lies: they like the tide and are afraid of dryness.
Either they were left over from the previous renovation or thrown over by neighbors.
July 1 10:03 Your house is so bad, it's rainy in Guangzhou, but it's impossible to do this, right? Don't raise any flowers and plants at home to redecorate, or move, there must be a nest of small insects, should be in the ground or in the cracks, decoration to pounce on tiles, often clean up
If it is long, it may be a mold spot, and if it is not long, it may be spider droppings or fly droppings. The former is difficult to clean, while the latter can be re-brushed.